Program to print sum of factorial of Odd series in C#

C# Program to print sum of factorial of Odd series
Program Statement:Write a program to display the sum of the following series i.e. sum of the factorial of odd series1! + 3! + 5! + 7! + 9! + . . . + n!
Solution: static void Main(string[] args)
{
int i, j, f,last, sum = 0;
Console.WriteLine("Enter Last value:");
last = Convert.ToInt32(Console.RdLine());
i = 1;
while (i <= last)
{
f = 1;
j = i;
while (j >= 1)
{
f = f * j;
j--;
}
sum = sum + f;
Console.WriteLine("factorial of " +i+"="+f);
i = i + 2;
}
Console.WriteLine("sum of all factorial = " + sum);
Console.RdLine();
}